At this rate, Will Smith's head is gonna swell so much, he'll only be able to appear in IMAX movies. Co-starring with a bunch of funny-looking 'droids, the king of the summer blockbuster watched his new thriller, I, Robot, rack up $53.3 million at the box office. (That's $13.3 million more than producers hoped for and $1.1 million more than Men in Black II took in two years ago.) As if any other film mattered to movie-goers over the weekend, Spider-Man 2 fell to second place with $24.2 million, Hilary Duff's A Cinderella Story opened in third with $13.8 million, Anchorman: The Legend of Ron Burgundy dropped to No. 4 with $13.4 million and Fahrenheit 9/11 rounded out the top five by taking in another $7 million.